docs: def gen_multi_key(self, values, db='default'):
          """Takes a list of generations (not table keys) and returns a key."""
          db = settings.DB_CACHE_KEYS[db]
          if db and len(db) > 100:
              db = db[0:68] + self.gen_key(db[68:])
          return '%s_%s_multi_%s' % (self.prefix, db, self.gen_key(*values))